Pith Number

pith:O2TKLPQQ

pith:2019:O2TKLPQQC3CA6JU6GZGTDWWREK

not attested not anchored not stored refs pending

A Systematic Analysis of Stellar Populations in the Host Galaxies of SDSS Type I QSOs

Feng-Jie Lei, Hong Wu, Jun-Jie Jin, Xian-Min Meng, Yi-Nan Zhu

arxiv:1904.04426 v1 · 2019-04-09 · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{O2TKLPQQC3CA6JU6GZGTDWWREK}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-17T23:48:59.037471Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

76a6a5be1016c40f269e364d31dad1229c6d6271954b8fa46ea8fc3cdfe969be

Aliases

arxiv: 1904.04426 · arxiv_version: 1904.04426v1 · doi: 10.48550/arxiv.1904.04426 · pith_short_12: O2TKLPQQC3CA · pith_short_16: O2TKLPQQC3CA6JU6 · pith_short_8: O2TKLPQQ

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/O2TKLPQQC3CA6JU6GZGTDWWREK \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 76a6a5be1016c40f269e364d31dad1229c6d6271954b8fa46ea8fc3cdfe969be

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c37489056f87aff48d3b94257738b6d8e82101d3dea9b53e45fecb160d871920",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-04-09T02:27:08Z",
    "title_canon_sha256": "61965c0f36a9cfbbcdec5c9ae92ee8c6bb7274d50c53fd2e63843393e2f2cf71"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.04426",
    "kind": "arxiv",
    "version": 1
  }
}